a. Purchased $60,000 of merchandise from Sierra Co. on account, terms 1/10, n/30. b. Paid the amount owed on the invoice within the discount period. For a compound transaction, if an amount box does not require an entry, leave it blank or enter "0". c. Discovered that $10,000 of the merchandise was defective and returned items, receiving credit. d. Purchased $7,500 of merchandise from Sierra Co. on account, terms n/30. e. Received a check for the balance owed from the return in (c), after deducting for the purchase in (d)